docs: def collect_compare_zips_into(left, right, added, removed, altered, same):
      """
      collects the differences between left and right ZipFile instances
      into the lists added, removed, altered, and same.  Returns a tuple
      of added, removed, altered, same
      """
  
      for event, filename in compare_zips(left, right):
          if event == LEFT:
              group = removed
          elif event == RIGHT:
              group = added
          elif event == DIFF:
              group = altered
          elif event == SAME:
              group = same
          else:
              assert False
  
          if group is not None:
              group.append(filename)
  
      return added, removed, altered, same